Union-grinding machine.



H. G. GARLSON.

UNION GRINDING MACHINE.

APPLICATION FILED MAR.31,1914.

1,120,278. Patented Dec. 8,1914.

2 SHEETS-SHEET 2.

WITNESSES: M/VE/VTUI? M hyalmarG. Gar/son W Arm/ms ATE HJALMAR G.CARLSON, F WORCESTER, MASSACHUSETTS, ASSIGNOR TO ROCKWOOD SPRINKLERCOMPANY OF MASSACHUSETTS, OF WORCESTER, MASSACHUSETTS, A

oonrorron or MASSACHUSETTS.

UNION-GRINDING MACHINE.

menace.

Specification of Letters Patent.

Patented Dec. 8, 1914..

To all whom it may concern:

Be it known that I, HJALMAR G. CARL- SON, a citizen of the UnitedStates, residing at Worcester, in the county of lVorcester and State ofMassachusetts, have invented a new and useful Union-Grinding Machine, ofwhich the following is a speci ication.

Although this invention is designed particularly for grinding unions,and is shown in the drawings as applied to that purpose, it is to beunderstood that it is capable of being applied to the grinding togetherof any two surfaces of a spherical or substantially spherical form.

The principal objects of the invention are to provide for grinding twosuch surfaces together in such a manner that they Wlll fit each otherwhen alined or when out of alinement; to provide for continually anduniformly moving the two spherical sur faces relatively to each otherdurin the grinding operation for the purpose-o. pro ducing a truespherical surface on each of the parts; to provide a simple, durable andpracticable mechanism for accomplishing these results of such form thatit occupies comparatively little space; and to rovide a construction inwhich a plurality oi grinding units can be set up on one machine in aconvenient manner and operated by one operator.

The invention also involves unprovements in details of construction andcombinations of parts as 'will appear hereinafter.

Reference is to be had to the accompanying drawings in which, Figure 1is an end elevation of a machine constructed in accordance with thisinvention for grinding pipe unions; Fig. 2 is a plan thereof with partsin section on a line slightly above the table; Fig. 3 is an enlargedplan of one of the units of the machine; Fig. 4 is a sectional view onthe line H of Fig. 3; Fig. 5 is a sectional view on the line 55 of Fig.2; Fig. 6 is a side elevation of part of the mechanism shown in Fi 2;Fig. 7 is a sec tional view on the line 7 of Fig. 2; Fig. 8 is asectional view on the line 8-8 of Fig. 2; Fig. 9 is a fragmentary viewshowing the union members in a position opposite that shown in Fig. 4;and Figs. 10 and 11 are elevations of the eccentric and its connectedparts showing different positions thereof.

The invention is shown as embodied in a machine provided with asupporting base 10 for a table 11 on which the parts of the machine aresupported. On this table are legs 12 extending upwardly carrying aplatform 13 for receiving the work to be operated upon. Underneath thetable the main shaft 15 is supported carrying a driving pulley 16. Thisshaft extends along the table and is provided with means for 0 eratingthe several units of the machine. his means 'is shown as com arising aseries of gears or pinions l7 eacli operating a gear 18 fixed to atransverse shaft 19. One of these shafts and sets of gears is arrangedfor each unit of the machine.

Fixed to the end of one of the shafts 19, preferably the end one, is acrank disk 20. This disk is provided with a T-slot 21 in which isadjustably mounted a bolt 22 for connecting the end of a itman 9.8 withthe crank. By adjusting t is bolt along the slot the eccentricity, andtherefore the throw, of the pitinan can be modified. The other end ofthe pitman is connected by a bolt 24 with a slide rack 25 which operatesin a guide 26 in a bracket on the side of the frame. This rack 25 isprovided with teeth on the bottom meshing with a pinion 27 fixed to atransverse shaft 28. This, therefore, constitutes a rack and piniondrive for this shaft. The shaft 28 is supported under the table and isprovided on its 0 pcsite end with a gear or pinion 29 mes iing with arack 30 which slides in ways under the front side of the table andextends substantially throughout the length of the table. This rack isprovided with a second set of rack-teeth 31 on one edge thereof meshingwith a plurality of pinions 32, one :ach unit of the machine. Eachpinion red on a vertical shaft 33 extending up through the table andcarrying on the top thereof a head 34-. This head is provided with aring 35 secured to the top thereof for receiving-inside the same one ofthe members A of the union to be ground. It

will be obvious that the rotation of the main shaft results in anoscillation of this union on its own ertieal axis. The parts preferablyare so designed that the union will turn through either more or less,prefcomplete rotation for the reason that it is tilt desired that anyirregularity in the grinding shall not be repeated in the same place onsubsequent operations.

Each of the shafts 19 is mounted in bear ings, as 39, on the under sideof the table and each one is provided with an eccentric 40. Thiseccentric is provided with an eccentric strap 41 of any desiredcharacter to which is connected a rod l2 secured by a set screw 43 atthe end in a yoke 44. The effective length of the rod can be adjustedobviously by changing the position of the rod in the yoke. At the topthe yoke is bifurcated and provided with a transverse perforation forreceiving a pivot pin 45. This pin passes through an elongated slot 4:6in the end of a lever 4:7. The elongation of the slot, as indicated inFig. 4:, is for the purpose of allowing a little play. On the other endof this lever is a head 48 adapted to support a weight 49 and providedon the bottom thereof with a socket member 50 for receiving the othermember B of the union to be ground. Inside the socket member 50 is acentral projection 51 which is fixed to the head by a screw or the likeand serves to center the member B in the socket member to hold it inposition therein. The head 48 is provided with a handle 52 formanipulating it, as will appear hereinafter. The lever 47 is fulcrumedand guided by means of the following mechanism: The table is providedwith a vertical perforation therethrough for receiving a cylindricalplunger 55. On the top this plunger is pro vided with a transverse pivotpin 56 to which is pivotally connected a fulcrum piece 57 which has abearing for the lever 4.8. It will be seen that this plunger is free tomove up and down and that the lever is free to turn on the pin 56 andalso on the plunger as centers, so that while the lever cannot movesidewise as a whole, it can move up and down and can rock up anddown ateach end also sidewise at each end. Of course, it can turn in its bearinin the fulcrum piece. Extending down from the platform 13 is a hook 59for engaging the lever 47 and holding up the head d8 when the parts arenot in use. Tn operation, a female pipe union memher A is placed on thedisk 84 within the ring 35 and a male union member B within the socketmember 50. Grinding material is placed on the spherical seat at the topat the lower union member, and the upper union member is allowed to reston the lower one in order that the grinding operation may take placeThis operation is er formed by the series of motions hereto oredescribed. The seat on. the top of the female member A of the pipe unionand the lower end of the male member B being previously turned up to aspherical form, as is commonly done in this art, it will be understoodthat the weight 49 holds the upper member B down on its seat.Consequently, the turning motion of the member A results in performing apart of the grinding operation. This turning motion is reversed atintervals so that if there is any irregularity in either member of theunion, it will not on any two subsequent operations of the lower membercome into the same position thereon. This result is assisted by the factthat the lower member does not turn through an even number ofrevolutions. The motion of the member B is a compound rocking motion.The rise and fall of the eccentric rod 4:2 rocks the upper member in theplane of the paper in Fig. 4, the plunger 55 ofiering no resistance tothis motion. But the sidewise motions due to the eccentric whentransmitted through the fulcrum member 57 to the head 48, aretranslated, not into a similar sidewise motion of this head, but into arocking motion on an axis transverse to the axis on which the head isrocked by the up and down motion of the eccentric rod.

This will be obvious from the fact that the fulcrum member prevents thelever 47 from moving sidewise at the fulcrum point and from the factthat the lower end of the pipe union member B is centered in thespherical seat of the lower member. Consequently, this attemptedsidewise motion is converted into a rocking motion about the center ofthe sphere of which the seats of the union members form a part. In otherwords, two rocking motions are secured about two axes at right angles toeach other, both passing through the center of this sphere. When it isdesired to change the unions being ground, the head is raised by thehandle 52 and the two unions taken out. It is found in practice that itis not necessary to fasten these unions in position, as a little turningmotion on their part is not objectionable, and tends to make thegrinding operation all the more uniform. lif it is desired to keep oneof the units out of operation while the machine is working, the unionscan be taken out of it and the 'lever 47 allowed to rest on the hook 59.

In practice, it is found that this machine grinds the previously turnedsurfaces to an accurate spherical joint so that it is not necessary tohave the union members in alinement with each other in order to get agood joint, that the result is accomplished in a very short time withthe expenditure of a small amount of power, and that a single man canreadily supply, and take care of,

four or more units and secure a large production.

ma am Although I have illustrated and described the invention as appliedonly for the purpose of grinding unions, and shown only a single form ofmechanism, I am aware of the fact that the principle of the invention asexpressed in the claims can be carried out in other forms and can beused for other analogous purposes. Therefore, I do not wish to belimited in these respects but What I do claim is- 1. In a machine forgrinding unions, the combination with two heads each having means forsupporting and vcentering one of the two halves of the union, of meansfor turning one of said heads on its own axis,

and means for rocking the other head while held in position to keep thetwo halves of the union in contact.

2. In a machine for grinding unions, the combination with two headslocated facing each other and each one adapted to hold one member of apipe union, of means for turning one of said heads about its own axis,and means for simultaneously rocking the other head about the center ofthe sphere of which the seats of the two members of the union form apart.

8. In a union grinding machine, the combination with two heads arrangedin alinement with each other for supporting the two halves of a union,means for turning the one of said heads supporting the female unionmember constantly about the axis of said female union member, and meansfor simultaneously giving the other head a compound transverse rockingmotion.

l. In a union grinding machine, the combination with two heads forsupporting the two members of the union, one of said heads facingupwardly and the other downwardly, whereby the upper head and unionmember therein rest upon the lower union member, and means for rockingthe upper head and its union member about on the seat furnished by thelower union member.

5. In a union grinding machine, the combination with two heads, onefacing upwardly for supporting the female member of a union and theother downwardly for holding the male member, whereby the male unionmember rests upon the female union member, means for turning the lowerhead of the axis thereof, and means for rocking the upper head on theseat furnished by the lower union member and about the center of thesphere in which said seat is located.

6. In a union grinding machine, the combination with two heads forsupporting the two members of a union, one of said heads facing upwardlyand the other downwardly, whereby the upper union member rests upon thelower union member, and means for rocking the upper head and its unionmember on the seat furnished by the lower union member in two transverseplanes.

7. In a union grinding machine, the com- 'on its own vertical axis,means for holding the other member of the union on said seat andpressing it down u on the seat by gravity, said means being ree to moveuniversally, and means for rocking the upper member of the union abouttwo transverse axes both concentric with the spherical surface of whichsaid seat forms a part.

8. In a union grinding machine, the combination with two heads forsupporting the two halves of a union, one facin upwardly and the otherdownwardly, an the latter located over the former'and adapted to restthereon by gravity when the union is inserted, means for oscillating onehead on its own axis, and means for simultaneously rocking the otherhead about a transverse central axis.

9. In a union grinding machine, the combination of a head for sup ortinga member of the union to be ground a crank, means connected with thecrank for oscillating said head about a vertical axis, a second headhavin means for receiving the other member o the union located above thefirst'head and adapted to rest thereon by gravity when the union membersare in position, and.

means operated in conjunction with'said crank for rocking the upper headon a transverse axis inter'sectin the first named axis.

10. In a union grini' l bination of a supporting table, a vertical shaftextending through the table, means on the top of said shaft forsupporting one member of the union to be ground, a crank, means forirning the crank, a rack connected with said crank and reciprocatedthereby, a shaft having a pinion thereon meshing with the rack, andmeans for transmitting the motion from the shaft to said vertical shaftfor oscillating the letter.

11. In a union grinding machine, the combination of a vertical shaft,means'on the top thereof for supporting the female half of a union to bemind with the seat up, means for oscillating said shaft on its own axis,a head above said shaft having means ing machine, the com- M0 in thebottom thereof for receiving the other combination with means forsupporting the female member of a pipe union with its seat up, means forholding the other member of the union upon said seat, the last namedmeans comprising a weighted head, a lever fixed to said head, and meansfor raising and lowering the outer end of said lever to rock the uppermember of the union on said seat,

" male member of a pipe union with its seat 'bination with means forsupporting the fe-,

up, a weighted head for holding the other member 0 the union upon saidseat, a lever fixed to said head, and an eccentric arranged in a planetransverse to said lever and pivotally connected with the outer endthereof for rocking the upper unionmember onasaid seat. I

14; In aunion grinding machine, the commale member of a pipe union withits seatv exposed, a head for'holding the other member" of the unionupon said. seat, a lever fixed to said head, and means for raising andlowering the outer end of said lever to rock the second member of theunion on said seat and for rocking said lever laterally.

- 15L In a union'grindin machine, the comb'ination with means for oldingthe female member'of a pipe union with its seat on top, and means forturning said member on its own-vertical axis, of a head for holding theother, member of the. pipe union with its seat down on'the first namedseat, a lever fixed to said head andextending therefrom, and means forgiving the outer end of said lever a substantially circular motion in aplane transverse to the lever, whereby said upper memberof the unionwill be rocked on its seat during the up and down motion of the lever. I1 v 16. In a union grinding machine, the combination with means forholding thefemale member of a pipe union with its seat on top,

of a head for holding the other member of the pipe union with its seatdown on the first named seat, a-lever fixed to said head and extendingtherefrom means for giving the outer end of said lever a substantiallycircular motion in a plane transverse to the lever, whereby said uppermember of the 13. In a union grinding machine, the combination withmeans for supporting the fema am union will be rocked on its seat duringthe up and down motion of the lever, and means permitting saidup anddown motion and for restricting the sidewise motion of the lever andtransmitting it. to said head as a rocking motion.

17 In a union grinding machine, the combination with means for holdingthe female member of a pipe union with its seat on top,

of a head for holding the other member of the pipe union with its seatdown on the first named seat, a lever fixed to said head and extendingtherefrom, means for giving the outer end of said lever a substantiallycir-v 18. In a union grinding machine, the combination of means for suporting and turning the female member of a pipe union, a head abovesaid'means havin means on the bottom thereof for holding t e othermember of the pipe union on the top of the first named member, aleverfixed to said'head and projecting therefrom, an eccentric.v rodconnected with the end of said lever for operating it, a fulcrum memberconnected with the lever between its ends, a freely movable verticalplunger below the fulcrum member pivoted to the fulcrum member on anaxis transverse to the lever, means for operating said eccentric rod,and means for turning the first named means.

In testimony whereof I have hereunto set my hand, in the presence of twosubscribing Witnesses.

'IIJALMAR G. CARLSON. Witnesses: l

' Cnar'ron KENDALL, Greener A. lPnArr.

